No you don't have to just because your license says c-3. If you are at the capacity of a c-1, then only 1 needs to be present. I have a c-2 and I run under a c-1 right now, but will go back to a c-2 later. When I had a c-3, there were days that we both were not needed because we weren't at that capacity, so someone got a day off
